5.5 L V8 BiTurbo models carry the 63 model designation, shared with the 6.2L V8 models. Visually, the 2011 S63 AMG is differentiated from the 2010 model (itself face-lifted over the 2009 S63) by the more angular design of the chromed dual exhaust tips, which also sport embossed AMG logos, as well as new forged wheels.